Re: n-dim matrices

Karl Glazebrook wrote:

> This also addresses one pain in current PDL which is the
> difficulty of multi-dim indexing.

I like it, too ;)

> > print $a[[0,0,0]];    # literal ref list
> > print $a[0;0;0];      # literal singleton ; list
> > print $a[[$y,$y,$y]]; # variable-based ref list
> > print $a[$y;$y;$y];   # variable-based singleton ; list
> > print $a[[@lorigin]]; # ref to copy of array variable
> > print $a[\@lorigin];  # ref of array variable
> > print $a[$rorigin];   # ref variable
> > print $a[diagonal(0)];# function that returns array ref
> >
> > There...  8 ways to do it...
> 
> Do we really need 8 ways?

No, at least 18. One more piece of semantics that would be appreciated
is optional omission of trailing dimensions in slices, e.g. for a 3-dim
@a:

  @a[0:1] == @a[0:1;] == @a[0:1;;]

 Christian